[vim/vim] debugger: crash when evaluating a variable in a :def function frame (PR #21111)

Problem:  In the debugger ">up" and ">frame" select an older function call
          frame, but get_funccal_local_ht() and the related functions check
          current_funccal while returning a dictionary of the frame that
          get_funccal() selected.  A :def function keeps its local variables
          on the vim9 stack, its funccall_T has no l: and a: dictionaries and
          is allocated cleared, so with such a frame selected the returned
          hashtab has a NULL ht_array and evaluating any variable name at the
          debug prompt crashes in hash_lookup().
Solution: Check the funccal that is actually used and return NULL when it has
          no l: variables, so that the variable is reported as undefined
          instead.
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21111

-- Commit Summary --

  * debugger: crash when evaluating a variable in a :def function frame

-- File Changes --

    M src/testdir/test_debugger.vim (45)
    M src/userfunc.c (43)

-- Patch Links --

https://github.com/vim/vim/pull/21111.patch
https://github.com/vim/vim/pull/21111.diff

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